/*
html,
body {
  height: 100%;
  padding: 0;
  display: block;
  margin: 0;
}

body {
  letter-spacing: 2px;
  text-align: center;
}
*/

.flex_container {
  margin-top: 20px;
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -ms-flex-flow: column wrap;
      flex-flow: column wrap;
  height: 100%;
  -webkit-box-pack: center;
      -ms-flex-pack: center;
          justify-content: center;
}

form {
  margin: auto;
}

.input_wrap {
  /*width: 380px;*/
  max-width: 100%;
  position: relative;
}
.input_wrap .after {
  position: absolute;
  height: 2px;
  width: 100%;
  background: rgb(20, 21, 23);
  left: 0;
  bottom: 0;
  -webkit-transform: scale(0, 1);
          transform: scale(0, 1);
  -webkit-transition: .3s;
  transition: .3s;
}
.input_wrap span {
  display: none;
  font-size: 20px;
  color: rgb(20, 21, 23);
  position: absolute;
  bottom: 50%;
  -webkit-transition: margin .8s;
  transition: margin .8s;
  opacity: .8;
  margin: 0;
  left: 50%;
  font-weight: 100;
}
.input_wrap span.in {
  margin-bottom: 20px;
}

.receive-input {
  -webkit-appearance: none;
  border-radius: 0;
  border: none;
  outline: none;
  padding: 0 10px;
  height: 75px;
  width: 100%;
  /*font-weight: bold;*/
  background: rgb(218, 219, 222);
  font: 25px Helvetica;
  color: rgb(20, 21, 23);
  -webkit-transition: .3s;
  transition: .3s;
  text-align: center;
  letter-spacing: 3px;
}
.receive-input:focus::-webkit-input-placeholder {
  opacity: 0;
}
.receive-input:focus::-moz-placeholder {
  opacity: 0;
}
.receive-input:focus:-ms-input-placeholder {
  opacity: 0;
}
.receive-input:focus::placeholder {
  opacity: 0;
}
.receive-input:focus + .after {
  -webkit-transform: scale(1, 1);
          transform: scale(1, 1);
}
.receive-input::-webkit-input-placeholder {
  -webkit-transition: .3s;
  transition: .3s;
  color: #000000;

  font-size: 22px;
  /*font-weight: 900;*/
}
.receive-input::-moz-placeholder {
  -webkit-transition: .3s;
  transition: .3s;
  color: rgb(98, 101, 105);

  text-align: center;
  font-size: 22px;
  /*font-weight: 900;*/

  /*font-family: 华文新魏;*/
  font-family: 华文行楷;
}
.receive-input:-ms-input-placeholder {
  -webkit-transition: .3s;
  transition: .3s;
  color: rgb(98, 101, 105);

  text-align: center;
  font-size: 22px;
  /*font-weight: 900;*/

  /*font-family: 华文新魏;*/
  font-family: 华文行楷;
}
.receive-input::placeholder {
  -webkit-transition: .3s;
  transition: .3s;
  color: rgb(98, 101, 105);

  text-align: center;
  font-size: 22px;
  /*font-weight: 900;*/

  font-family: 华文行楷;
  /*font-family: 华文新魏;*/
}
.receive-input:focus {
  background: rgba(255, 255, 255, 0.3);
  /*font-weight: 900;*/
}
.receive-input.error {
  border-color: #ea1d1d;
  font-weight: 900;

  font-family: 华文行楷;
}
